Irregular resource element mapping
Apparatuses, methods, and systems are disclosed for irregular resource element mapping. An apparatus ( 800 ) includes a transceiver ( 825 ) that is operable to communicate with a Radio Access Network (“RAN”). The apparatus ( 800 ) includes a processor ( 805 ) that receives ( 1005 ), via the transceiver ( 825 ), a resource element mapping configuration comprising an indication of an irregular subcarrier spacing for a plurality of subcarriers for the UE. The resource element mapping configuration may be defined by the RAN based on a carrier frequency. The processor ( 805 ) applies ( 1010 ) the indicated irregular subcarrier spacing to resource elements (“REs”) of the UE according to the resource element mapping configuration for communicating with the RAN.
1 . A method performed by a user equipment (UE), the method comprising:
receiving a resource element mapping configuration comprising an indication of an irregular subcarrier spacing for a plurality of subcarriers, wherein the resource element mapping configuration is based on a carrier frequency, and wherein the resource element mapping configuration defines different sets of resource blocks (“RBs”) with different subcarrier offsets; and
applying the indicated irregular subcarrier spacing to resource elements (“REs”) according to the resource element mapping configuration.
2 . The method of claim 1 , wherein the indication of the irregular subcarrier spacing comprises a parameter that indicates a frequency offset between the plurality of subcarriers.
3 . The method of claim 2 , wherein the offset between two subcarriers of the plurality of subcarriers that are closer to a baseband direct current (“DC”) is a higher frequency offset than the frequency offset between two different subcarriers that are further away from the baseband DC.
4 . The method of claim 3 , wherein the frequency offset is determined based on at least one of a frequency range, a bandwidth, a default subcarrier spacing, a modulation and coding scheme, regulatory requirements, and whether a baseband DC subcarrier location is offset by 7.5 kHz relative to a center of the indicated subcarrier or not.
5 . The method of claim 2 , wherein each RE is centered on a subcarrier and the plurality of REs are centered in a frequency domain about a default subcarrier spacing, the irregular subcarrier spacing comprising a frequency offset achieves a subcarrier spacing between REs that is offset from the default subcarrier spacing.
6 . The method of claim 1 , wherein the indication of the irregular subcarrier spacing comprises a parameter that indicates a frequency offset between the subcarriers of each set of RBs such that, for each set of RBs, the offset between two subcarriers that are closer to a baseband direct current (“DC”) is a higher frequency offset than the frequency offset between two different subcarriers that are further away from the baseband DC.
7 . The method of claim 6 , wherein sets of RBs that are within a threshold frequency of the baseband DC are muted while different sets of RBs that are without the threshold frequency use a default subcarrier spacing (“SCS”), the muted sets of RBs not carrying any data.
8 . The method of claim 7 , wherein the muted sets of RBs are configured to send phase tracking reference signals (“PTRS”), the PTRS used for common phase error (“CPE”)/inter-carrier interference (“ICI”) estimation and for cancelling CPE/ICI on data subcarriers that are transmitted with the default SCS.
9 . The method of claim 7 , wherein the resource element mapping configuration for subcarriers of muted REs of the sets of RBs comprises at least one muted RE that coincides with a transmit DC subcarrier location when the location of the transmit DC subcarrier is within a resource grid.
10 . The method of claim 7 , further comprising receiving assistance information, the assistance information comprising information about a location of punctured bits that correspond to muted REs of the sets of RBs such that the punctured bits of the muted REs are ignored during decoding.
11 . The method of claim 1 , further comprising receiving rate-matching parameters that consider the irregular subcarrier spacing of the REs, the parameters comprising an indication of a number and a location of empty subcarriers for a rate-matching calculation.
12 . The method of claim 11 , further comprising, in response to not receiving rate-matching parameters and in response to no empty REs being used, performing normal reception and decoding of a transport block (“TB”).
13 . A User Equipment (“UE”), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receives a resource element mapping configuration comprising an indication of an irregular subcarrier spacing for a plurality of subcarriers, wherein the resource element mapping configuration is based on a carrier frequency, and wherein the resource element mapping configuration defines different sets of resource blocks (“RBs”) with different subcarrier offsets; and
apply the indicated irregular subcarrier spacing to resource elements (“REs”) according to the resource element mapping configuration.
14 . The UE of claim 13 , wherein the indication of the irregular subcarrier spacing comprises a parameter that indicates a frequency offset between the plurality of subcarriers.
15 . The UE of claim 14 , wherein the offset between two subcarriers of the plurality of subcarriers that are closer to a baseband direct current (“DC”) is a higher frequency offset than the frequency offset between two different subcarriers that are further away from the baseband DC.
16 . The UE of claim 13 , wherein the indication of the irregular subcarrier spacing comprises a parameter that indicates a frequency offset between the subcarriers of each set of RBs such that, for each set of RBs, the offset between two subcarriers that are closer to a baseband direct current (“DC”) is a higher frequency offset than the frequency offset between two different subcarriers that are further away from the baseband DC.
17 . The UE of claim 16 , wherein sets of RBs that are within a threshold frequency of the DC are muted while different sets of RBs that are without the threshold frequency use a default subcarrier spacing, the muted sets of RBs not carrying any data.
18 . The UE of claim 13 , wherein the at least one processor is configured to cause the UE to receives rate-matching parameters that consider the irregular subcarrier spacing of the REs, the parameters comprising an indication of a number and a location of empty subcarriers for a rate-matching calculation.
19 . A network equipment (NE), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the NE to:
determine a resource element mapping configuration comprising an irregular subcarrier spacing for a plurality of subcarriers, wherein the resource element mapping configuration is based on a carrier frequency, and wherein the resource element mapping configuration defines different sets of resource blocks (“RBs”) with different subcarrier offsets; and
transmit the resource element mapping configuration.
20 . A method performed by a network equipment (NE), the method comprising:
determining a resource element mapping configuration comprising an irregular subcarrier spacing for a plurality of subcarriers, wherein the resource element mapping configuration is based on a carrier frequency, and wherein the resource element mapping configuration defines different sets of resource blocks (“RBs”) with different subcarrier offsets; and
transmitting the resource element mapping configuration.